Alright, let's work through 20208979 times 9645887 step by step
20208979 × 9645887 = 9645887 × (20208979)
+ 9645887 × 9 yielding 86812983
+ 9645887 × 70 producing 675212090
+ 9645887 × 900 resulting in 8681298300
+ 9645887 × 8000 which equals 77167096000
+ 9645887 × 00000 that is equal 0
+ 9645887 × 200000 that results in 1929177400000
+ 9645887 × 0000000 which equals 0
+ 9645887 × 20000000 giving us 192917740000000

= 194933527819373
